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Old 06-08-04, 08:44 AM   #1
Dirty
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Angry why i dont have any option for 32bit colors on linux ?

i have 8, 16 & 24 bit color for X!free86 but no option for 32bit... ?

how do i get 32bit colors working on linux desktop

i installed the latest nvidia drivers. i am using redhat fedora 1 and slackware 9.1
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Old 06-08-04, 09:00 AM   #2
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Default Re: why i dont have any option for 32bit colors on linux ?

24bit(16.7million colours) is as good and you simply cannot tell the difference, 32bit colour is pretty usless for the desktop.
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Old 06-08-04, 09:48 AM   #3
Mr_PiCaLo
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Default Re: why i dont have any option for 32bit colors on linux ?

I believe the short answer is that X doesn't support 32 bit color, and as such it doesn't support alpha channels in basic operations. That's why things like window shadows arn't anything more than hacks right now.

I think that the freedesktop.org server is changing this... but i'm not sure
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Old 06-08-04, 10:00 AM   #4
russofris
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Default Re: why i dont have any option for 32bit colors on linux ?

X does not currently support alpha blending, which is where the extra 8 bits come from. Windows RGB is 8b per channel +8b alpha.

Thank you for your time,
Frank Russo
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Old 06-08-04, 10:31 AM   #5
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Default Re: why i dont have any option for 32bit colors on linux ?

Quote:
Originally Posted by Mr_PiCaLo
I believe the short answer is that X doesn't support 32 bit color, and as such it doesn't support alpha channels in basic operations. That's why things like window shadows arn't anything more than hacks right now.

I think that the freedesktop.org server is changing this... but i'm not sure
Thats funny because the Matrox line of cards do 32bit in X, both Nvidia and ATI only support 24 bit.
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Old 06-08-04, 04:45 PM   #6
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Default Re: why i dont have any option for 32bit colors on linux ?

Quote:
Originally Posted by russofris
X does not currently support alpha blending, which is where the extra 8 bits come from. Windows RGB is 8b per channel +8b alpha.

Thank you for your time,
Frank Russo
That is partially true. X does not support alphablending in uses such as transparent windows, however it does support 32bit depth. Just that 32bit depth is used just like 24bit depth, and so, some drivers support 32bit ad others stay with 24.

The RENDER extension is capable of doing alpha blended compositing operations. I don't know if it is capable of using RGBA or just handles the transparency separately. Anyway it is capable of doing this with the nvidia drivers and 24bit depth AFAIK.
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